—Why do you prevent them______playing computer games?---Because they have a bad______on teenagers.
#55019
A
from,effect
B
from,affect
C
to,effect
D
to,effect
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The river smells terrible. People must_____ dirty things into it.
#55102
A
be prevented to throw
B
prevent from throwing
C
prevent to throw
D
be prevented from throwing
The present on the desk  _______more than 100 yuan. 
#59257
A
spent
B
took
C
cost
D
paid